An unseasonable upper low east of the area helped fuel showers and thunderstorms over the southern Great Basin and Mojave Desert. Isolated flash flooding occurred.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS VEF wrote it up.
An unseasonable upper low east of the area helped fuel showers and thunderstorms over the southern Great Basin and Mojave Desert. Isolated flash flooding occurred.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before the first event at May 24, 8:21 AM PST, 4 hours 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 921 AM PDT SUN MAY 24 2015 .SYNOPSIS...SHOWERS AND THUNDERSTORMS WILL BE MOSTLY LIMITED TO THE SIERRA AND THE SOUTHERN GREAT BASIN FOR MUCH OF THE UPCOMING WEEK WITH DRY CONDITIONS EXPECTED ELSEWHERE. BELOW NORMAL TEMPERATURES TODAY AND MONDAY WILL TRANSITION TO ABOVE NORMAL LATER IN THE WEEK. && .UPDATE...RAISED POPS FOR THIS AFTERNOON OVER NORTHEAST SAN BERNARDINO COUNTY AND THE HIGHER TERRAIN OF CENTRAL AND SOUTHERN MOHAVE COUNTY. BAND OF SHOWERS WAS CURRENTLY MOVING SOUTH THROUGH NORTH CENTRAL MOHAVE COUNTY...AND HIGH RES MODELS SUGGEST THUNDERSTORM DEVELOPMENT OVER THE MOJAVE PRESERVE THIS AFTERNOON. NO OTHER CHANGES AT THIS TIME. && .PREV DISCUSSION... 252 AM PDT SUN MAY 24 2015 .SHORT TERM...THROUGH TUESDAY NIGHT. AN UPPER DISTURBANCE RESPONSIBLE FOR ONGOING SHOWER ACTIVITY TONIGHT WILL BY OVER SOUTHEAST CALIFORNIA BY 5 AM THIS MORNING AND THEN OUT OF OUR HAIR BY THIS AFTERNOON. HOWEVER, CLOUDS AND SHOWERS WILL CONTINUE TO WRAP AROUND THE BACK SIDE OF LOW PRESSURE OVER THE NORTHERN AND CENTRAL ROCKIES LEADING TO A FEW SHOWERS IN THE SIERRA, THE SOUTHERN GREAT BASIN AND POSSIBLY THE MOUNTAINS OF CLARK COUNTY INTO NORTHWESTERN ARIZONA TODAY. AS THIS WHOLE CONGLOMERATION OF WEATHER MAKERS MOVES EAST OF THE ROCKIES BY MONDAY, ANOTHER SYSTEM ENTERS THE PACIFIC NORTHWEST AND PROVIDES SUFFICIENT FORCING FOR MORE SHOWERS AND STORMS OVER THE SIERRA AND THE SOUTHERN GREAT BASIN MONDAY AND TUESDAY. ALTHOUGH A SOMEWHAT ACTIVE WEATHER PATTERN PERSISTS, WARMER CONDITIONS ARE STILL EXPECTED. TEMPERATURES WILL BE SIMILAR...IF NOT A FEW DEGREES WARMER TODAY AND THEN APPROACH NORMAL MONDAY AND TUESDAY. IT LOOKS LIKE THE 70S IN VEGAS ARE OVER FOR AWHILE AND AFTER ONLY A FEW BRIEF DAYS IN THE 80S, TEMPERATURES WILL WARM BACK TO WHERE THEY SHOULD BE FOR THIS TIME OF YEAR. .LONG TERM...WEDNESDAY AFTERNOON THROUGH SUNDAY MORNING. OPERATIONAL MODEL GUIDANCE CONTINUES TO BE IN GOOD AGREEMENT TONIGHT IN HAVING A RELATIVELY WEAK MID TO UPPER LEVEL TROUGH TRAVERSING ACROSS THE DESERT SOUTHWEST AT THE BEGINNING OF THE LONG TERM PERIOD. LINGERING MOISTURE...INSTABILITY...AND SUFFICIENT UPPER LEVEL FLOW WILL WARRANT AFTERNOON SHOWER AND ISOLATED THUNDERSTORM CHANCES IN THE HIGHER TERRAIN ACROSS THE NORTHERN INYO AND GREAT BASIN ZONES WEDNESDAY THROUGH THURSDAY AFTERNOON. THIS TROUGH WILL EXIT THE REGION THURSDAY NIGHT...ALLOWING A RATHER AMPLIFIED SHORTWAVE RIDGE TO BEGIN TO BUILD INTO OUR AREA FRIDAY. UPPER LEVEL FLOW WILL TRANSITION FROM NORTHWESTERLY FRIDAY AS THE RIDGE AXIS SLIDES OVER THE GREAT BASIN AND DESERT SOUTHWEST...ALLOWING TEMPERATURES ACROSS THE AREA TO CONTINUE A WARMING TREND THROUGH THE WEEKEND. GENERALLY...AFTERNOON HIGHS WILL RUN 5-8 DEGREES ABOVE NORMAL FOR LATE MAY ACROSS MOST AREAS...WITH MOST DESERT LOCALES RISING INTO THE UPPER 90S AND LOWER DESERT LOCATIONS...LIKE DEATH VALLEY...RISING INTO THE MID TO UPPER 100S. WHILE IT CONTINUES TO BE A POSSIBILITY THAT LAS VEGAS WILL BE ONE OF THE LOCALES APPROACHING THE CENTURY MARK THIS WEEKEND...DETAILS IN THE FORECAST...INCLUDING THE TIMING OF THE NEXT UPPER LEVEL TROUGH...NEED TO BE RESOLVED AS THEY WILL PLAY A ROLE IN HOW HIGH TEMPERATURES GET. AN INCREASE IN SOUTHWESTERLY FLOW WITH AN APPROACHING TROUGH THIS WEEKEND WOULD INCREASE MIXING AND INCREASE CHANCES OF THE FIRST 100 DEGREE DAY OF THE YEAR FOR LAS VEGAS. THIS WILL BE SOMETHING TO KEEP AN EYE ON THIS WEEK AS THE FINER DETAILS BECOME MORE CLEAR. .AVIATION...FOR MCCARRAN...A FEW SHOWERS ARE POSSIBLE IN THE VALLEY THIS MORNING WITH CIGS GENERALLY 8-10K FEET. WEST TO SOUTHWEST WINDS UP TO 10KTS THROUGH 15Z THEN LIGHT AND VARIABLE BEFORE TURNING BACK THE SOUTH AND INCREASING TO AROUND 10KT THIS AFTERNOON. SOME ISOLATED SHOWER ACTIVITY IS POSSIBLE AGAIN TODAY...BUT SHOULD MAINLY BE NORTH AND EAST OF LAS VEGAS. FOR THE REST OF SOUTHERN NEVADA...NORTHWEST ARIZONA...AND SOUTHEAST CALIFORNIA...ISOLATED TO SCATTERED SHOWERS TO CONTINUE THROUGH THE MORNING WITH ISOLATED THUNDERSTORMS LATER TODAY MAINLY ACROSS INYO...NYE...ESMERALDA AND LINCOLN COUNTIES WITH LESSER CHANCES SOUTH. ANY SHOWER/TSTORM HAS THE POTENTIAL OF PRODUCING WIND GUSTS TO 25KTS. AWAY FROM CONVECTIVE INFLUENCES WINDS ARE EXPECTED TO REMAIN SOUTH/SOUTHWEST AROUND 10-20KTS WITH CIGS AROUND 8-10K FEET. .SPOTTER INFORMATION STATEMENT...SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. && UPDATE...MORGAN SHORT TERM/AVIATION...SALMEN LONG TERM...PULLIN FOR MORE FORECAST INFORMATION...SEE US ON OUR WEBPAGE: HTTP://WEATHER.GOV/LASVEGAS OR FOLLOW US ON FACEBOOK AND TWITTER
The Cedar City radar (KICX), 129 km away, was scanning. The volume nearest the first event began at 20:58 UTC.
2 flash flood. Local standard time, as filed.
Flash flooding washed out sections of Echo Canyon Dam Road.
Rocks and mud washed over Highway 266 11 miles W of Lida.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2015Every state in 2015This day in weather historyWarnings in Nevada, May 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 578147, 578149.